Best snake gun I ever had was a 3" barrel (IIRC) Charter Pathfinder that I bored the cylinder out to .22 magnum (they didn't make a .22 mag at the time), and loaded it with those blue-tipped CCI snake shot. That thing weighed nothing (as a surveyor I already had a belt full of shit, and it sidpatched snakes regularly. When we were laying out a new structure or mine there were always snake of all varieties around the bunch of sheet metal coal cars used in the mind. We'd hook a chain to the Jeep and give them a good jerk, and it was game on. We would be doing a lot of fiddling with the instrument and rod and didn't have time to watch other places as we worked, so we "snaked it out" before we started work, especially if we were reopening a mine that had a lot of industrial junk laying around. Fun fact - copperheads,rattlers, black snakes and a variety of non-poisonous snakes would be laying on top of each other when we jerked an old mine car, which is a cool environment because of the2-4 inches of water in it. Never saw one snake attack another, except for king snakes which we didn't have in abundance. Puts an end to the idea that snakes crave sunlight - that's not to say they won't "sun themselves" to warm up after a cool night, but like us (and Goldilocks) they seek a temperature that's "just right".
When I wasn't working and just rambling the woods I never killed a snake unless it was near a footpath that people often used. If I were still able to ramble again, I'd invest in snake-catching equipment and just relocate them. Their role in controlling small rodents populations is much overstated - a rattler can eat one rat and it may be a month or so before he needs more food. The rodents multiply so fast that we'd have to be up to our ears in snakes for them to control them. That's why it's important to have a certain amount of other predators like hawks and foxes. Foxes have to be controlled, though, as they multiply so fast that if not controlled the native ground-nesting birds will be wiped out. That's what happened when I lived in the coal country of southwest Virginia. Not only were the native grey foxes in overabundance, but some guys who liked fox hunting with dogs imported some red foxes from Michigan; they are quite a bit bigger than our native red foxes and they could out-compete them. It got so bad that a lot of men (me included) started trapping them and selling fur. After about 3-4 years of that, we started seeing rabbits and ruffed grouse again.